Pulley



Sept. 22, 1959 Filed Feb. 24, 1956 Fla. 1.

A. .1. ROSE 2,905,004

PULLEY 2 Sheets-Sheet 1 INVENTOR ANTON 1/. ROSE 2M Maw ATTORNEYS Sept. 22, 1959 O E 2,905,004

PULLEY Filed Feb. 24;, 1956 2 Sheets-Sheet 2 W v V 7 INVENTOR AN TON J. ROSE United States Patent PULLEY Anton J. Rose, Lakewood, Ohio, as'sig'nor to A. If. Rose Manufacturing Company, Cleveland, Ohio Application February 24, 1956, Serial No. 67,582 3 Claims. (Cl. 74-2303 The present invention relates to an improved pulley construction, and an improved method and aparatus for producing the same. More specifically, the present invention relates to a novel method and apparatus for forming a novel two-piece pulley construction preferably from sheet metal stampings.

Prior art machines for producing sheet metal pulleys have usually been very complicated and expensive pertaining generally to a metal spinning process or an involved metal stamping process. These machines have failed to provide a simplified process for producing pulleys of this type. Furthermore, the sheet metal pulleys produced by such prior art machines have either been of the two-piece type wherein a flanged ring-like member was secured to a flanged cup-shaped member but not in a positively locked manner or of the two-piece type wherein two flanged cup-shaped members were telescoped together. or of the type wherein the inner of the two flanges forming the driving belt groove was formed by a folding over of the sheet metal; each of the latter two types of pulleys has a greater amount of material in their construction than is actually required to withstand the stresses and strains developed during normaluse.

To overcome these and other drawbacks of prior art pulleys and methods and machines for producing the same, it is the principal :object of the present invention to design a two-piece pulley construction wherein the parts are positively locked against relative movement and involving the use of a minimum amount of material, yet possessing suflicient strength to withstand the stresses and strains normally developed therein.

. Another important object of the invention is to provide a method and apparatus for producing a pulley having the desired design which will aflford a simple, eflicient and inexpensive procedure for making such pulleys. p

In carrying out the foregoing objects, the present invention preferably contemplates the stamping or blanking of a cup-shaped member having a flange and an offset portion adjacent one end and the subsequent assembling on this eup-shaped member of an annular or ringlike member having a flange thereon adapted to cooperate with the. flange and oifset portion of the cup-shaped member to define a groove for the reception of a power transmitting belt.

Additional objectsand advantages of the present invention will be readily apparent from a consideration of the following description and accompanying drawings, in which: t

Figure 1. is an elevational view of the two preformed along the line 4-4 of Figure 3, and showing the assemice bled blanks forming the pulley and a hub attached thereto;

Figure 5 is an elevational view, partly in section, of the apparatus of the present invention for assembling the blanks to form the pulley;

Figure 6 is also an elevational view, partly in section, showing the apparatus in a different position from that of Figure 5; and

Figure 7 is a sectional view taken along line 77 of Figure 6 but with the pulley structure and the upper part of the apparatus removed.

Referring now to the drawings, and in particular Figures 1-4, the pulley structure of the present invention comprises a cup-shaped member 2 defined by a crown or web 4 at one end thereof, a cylindrical body portion 6, and a flange 8 at the other end thereof. This cupshaped member is further defined by an offset portion 10 adjacent the flange 8 and also a peripheral or annular bulge 12 in the cylindrical body portion intermediate said offset portion and crown, as best seen :in Figure 4.

Disposed on the cup-shaped member is an annular or ring-like member 14 comprising a cylindrical portion 16 and an outwardly and rearwardly arranged flange 18 disposed at one end of the cylindrical portion 16. The cylindrical portions of the cup-shaped member 2 and annular member 14 are preferably of such size as to be in tight fitting relationship with the latter member positively locked on the former against axial movement by means of the offset portion 10 and peripheral bulge 12. The flanges 8, 18 on these members combine with the oflset portion 10 to define an outwardly diverging circumferential groove intended to receive a V-shaped driving belt (not shown).

These members 2, 14 are preferably made of sheet metal of uniform thickness upon which are preformed suitable drawing and stamping operations to produce the desired configurations.

It will be noted that the outer diameter of the peripheral bulge 12 and the outer diameter of the cylindrical portion 6 of the cup-shaped member 2 are approximately the same as the outer and inner diameters, respectively, of the cylindrical portion 16 of the annular member 14. This dimensional relationship between the parts permits a generally smooth outer surface to be presented between the web end of the cup-shaped memher and the flanged end of the annular member 14. This generally smooth surface will eliminate the possibility of accidentally cutting or deforming the end of the annular member 14 adjacent the peripheral bulge 12 in the event that the tools employed to connect the subject pulley to an operating machine inadvertently come into contact with this part of the pulley structure. In this connection it should also be noted that the outer diameter of the offset portion 10 of the cup-shaped member is also approximately the same as the outer diameter of the cylindrical portion of the annular member. This feature renders it possible to dispose the outwardly and rearwardly extending flange 18 of the annular member at the end thereof adjacent the peripheral bulge 12 and still present a generally smooth bottom for the beltreceiving groove.

The web 4 of the cup-shaped member may be suitably apertured for the reception of a hub structure 20, shown in Figure 4, which hub is employed to mount the pulley on a cylindrical rotary member.

The method of assembling the annular member 14 on the cup-shaped member comprises the positioning of the annular member over the web end of the cup-shaped member, the latter having the configuration illustrated in Figure 1 at this time. Since the inner diameter of the cylindrical portion of the annular member is preferably approximately equal to or slightly less than the outer diameter of the cylindrical portion of the cup-shaped member, it is necessary to exert a slight axial force on the flange 1,8, of the. annular. member, to, slide the same over the cup-shaped member until it'abuts the offsetpor tion 10,- as seen inFigure 2.

The next. step; contemplated in the present methodfinvolves the formation of the peripheral bulge IZ'inthe cylindrical portion of the cup-shaped member immediately abovetheupper end of the-annular member, as best seen in Figure 4.

It should, be apparent that the annular member-will be positively retained on the cup-shaped member by the.

cooperation of the oifset portion 10 and bulge 12" on the cup-shaped member with. the frictional forces produced by the tight-fitting cylindrical surfaces of the members. With, this construction, relative axial movement of the members, is prevented by the offset portion and annular bulge, while relative rotary movement is prevented by the frictional forces present.

To permit the pulley of the present invention to be produced by the method described hereinabove, the em ployment of an apparatus or machine illustrated in Figures 7 iscontemplatedi This apparatus-includesa table 22, a male die means 24; anda mating femaledie means 26; the former die means being associated with the table and the latter die means preferably being associated with a punch press or similar vertically reciprocable means 28; the operating mechanism for which is not shown.

The table 22 is arranged on a suitable, mounting base (not shown) and is provided with a planar top member 30 secured thereto. This top member 30 has an internally countersunk hole 32' therein for the reception of a stationary, vertically projecting plug 3'4 having a frusto-conical surface 36' intermediate the ends thereof and a conical upper end 38. Themal'e die means-comprises a base defined by a disc-like member 40, having a centrally disposed aperture 42 for fitting over the plug 34 and also having a circular recess 44' in-the upper-face thereof. The base further comprises a-ring-like member or locating pad 46, preferably made'of a tough, resiliently deformable material, mountedin this'recess- 44- and con-' nected to the disc-like member in themannerseen in Figures Sand 6.

The male die means 24-further'comprises a'plurality of die segments or jaws'48-loosely mounted within the ring-like member 46 of the'base andprovided with a peripheral external flange 50 at the bottom thereof, said flange being receivedin acomplementary contoured peripheral recess 52-provided at the bottom of the ring '46. The depth of the recess 52in the ring is greater thanthe depth ofthe peripheral flange 50' for a purpose hereinafter to be described; The die segments 48 include an outer surface having-projections 54, 56 thereonsimilarto the peripheral bulge and offset portion tobe formed in the pulley; These segments further include inner cammed surfaces 58, 6t); complementar-yto and engageable with the cammed surfaces on the stationary plug 34', and an outer circumferential recess 62 is provided in these segments for the reception ofa spring- 64. The compressive effect of this spring-causesthedie segments to be retracted radially, and such retraction is accompanied by a slight elevating of the segments through the action of the cammed surfaces thereon riding over the cammedsurfaces' of the-plug,

The male die means 24 is looselymounted on the table top 30; preferablyby any" appropriate number of bolts 66 having a head 68 vertically slidablein-a-recess 70in the tabletop. It should: be apparent that the male die means. will. have a limitedv vertical movement defined by the depth of: the recesses, 70 in. the tabletop and the thicknessof the boltheads 68.

A plurality ofpins-72 are arranged-in aligned apertures inthe table 22. and top 3.0and are urged: upwardly into contact with the lower surface of the disc-like member 40 of'the male die means by springs (not shown). These pins operate to normally position the male die means at an elevated level, wherein the lower surface of the disc member 40 is slightly displaced from the surface of the table top.

While the male die meanstisimaintained at this elevated level, the die segments are retained in a radially retracted and axially projected. position by the spring 64, aslhas already. beendescribed.

The femalv diemeans 26Icomprises, an. annular. element 74 attached to the vertically reciprocable punch press 28. The lower end-I ofthis annular element is: shaped complementary to the, inner surface of.the. annular member 14 for engagement therewith. The punch press is provided with a knockout piston or plunger 76 for disengaging the pulley from the female die by reciprocal movement therein.

In operation of" the above described; apparatus, the punch press and'female die means are raised from the position shown in Figure S'and' the cup-shaped blank Z is placed on the male die means with the flange 8 thereof).

resting-on the upper surface of'the ring 46, as bestseen in Figure 5. The male die is so constructed that when the cup-shaped blank; is first placed thereon, the die seg ments 48 will be completely out of contact with the cylindrical side wall of the blank and the upper surface of these segments will contact theweb of'the blank.

Theannular member is then placed directly over the web end of the cup and the punch pressis'moved downwardly, with the lower end of the female die means engaging the annular member and.v forcing it axially over the cylindrical portion of the cup-shaped. blank until the annular member contacts the offset portion 10 of the cup, as seen in Figure 5'.

positioning the annular member against the offset portion of the. cup does not disturb the position of the die segments which remain in their retracted, and", elevated posi tion during such relative movement. This is effectedby designing the diameters of the cylindrical portions of" the annular member and'the cup so thatwhile they fit snugly together when assembled, theforce necessary to'slide-the annular member over the cup. is not suflicient toovercome the compressive effect of the spring 64 orthe biasing effect of the spring-actuating pins 72.

After the parts have been assembled inthe above manner, continued descent of thepunch press andfemale die= but the die segments are now in contactwith the cy1in-- drical portion thereof.

As the punch press and female die descend still fan ther, the resilient ring 46 of the base of-the male die is slightly compressed axially by relative downward'movement of the cup-shaped member and flange thereonwith respect to the base of the male die. This relative downward movement of the cup causes-the die segments to bemoved downwardly also with the cammed surfaces 58, 60-thereof riding over the cammedsurfaces 38, 361of'the plug 34'. This movement of-the'segmentsforces them farther out into deforming contact. with the; cylindricalv portion, of the cup, whereby the; projection 54? on each segment forms the peripheral locking. bulge in the cupshaped member. immediately above the; annular: member, asbest seen inFigure 6. Duringthisdeforming, theprojection- 56;o1 1.,each. segment, aligns=itself with: the offset.

It should be noted thatthis' relative movement between the male and female, dies in,

portion of the cup. This annular bulge, so formed, cooperates with the offset portion on the cup-shaped member to positively secure the parts in assembled position and prevents any relative axial movement therebetween.

After the punch press has completed its descent, it is then elevated, the male die means moving upwardly therewith for the first part of the ascent until the latter is stopped from further upward movement by the bolt heads 68 abutting the upper surface of the recesses 70. At this point the continued ascent of the punch press is accompanied by an upward movement of the pulley structure and die segments until the cammed surfaces 50, 52 of the segments 48 and ring 46, respectively, engage one another, whereby further elevating of the punch press permits the spring 64 to radially compress the die segments to their normally retracted and projected position. The die segments are now disengaged from the cylindrical portion of the cup 2. The pulley structure, being released from the male die means, follows the punch press and female die means upwardly until it is forced out of the cavity in the female die by the knockout plunger 76.

The pulley structure is now completed and a suitable hub may be secured thereto as described hereinbefore.

It is to be understood that various gages of sheet metal may be employed to produce the novel pulley structure by the novel method and apparatus of the present invention.

While specific features and structures have been shown and described in defining the present invention, it is to be understod that variations and modifications may be made to such features and structures within the scope of this invention as set forth in the appended claims.

I claim:

1. A pulley comprising a first sheet metal member having a cylindrical portion and provided with an outwardly extending flange at one end thereof, said member having a portion deformed radially outwardly to define an offset shoulder adjacent said flange and having another portion deformed radially outwardly to define a peripheral bulge intermediate said offset shoulder and the other end of said member, a second sheet metal member press fitted on said first member and comprising a continuous cylindrical portion disposed between and in contact with the oflset shoulder and the bulge on said first member,

and said second member further comprising an outwardly extending flange cooperating with said first named flange to define an annular groove for the reception of a pulley belt, the outer diameters of said olfset shoulder, said peripheral bulge, and said cylindrical portion of said second member being substantially equal.

2. The structure defined in claim 1 wherein the thickness of each of the members is substantially the same and is also uniform throughout the entire lengths thereof.

3. A V-belt pulley comprising a cup-shaped member having a web at one end thereof, an outwardly and forwardly extending flange at the other end thereof, an offset portion adjacent said flange, and a cylindrical portion intermediate said ends; an annular member assembled on said cup-shaped member, said annular member comprising a continuous cylindrical portion having an outwardly and rearwardly extending flange at one end thereof, the cylindrical portions of said members being in press fit engagement with each other, and said one end of said annular member abutting said ofiset portion with said flanges diverging radially outwardly, and said cup-shaped member being deformed radially outwardly intermediate its ends and adjacent the other end of said annular member to define an annular bulge, the outer diameter of said bulge being approximately equal to the outer diameter of the cylindrical portion of said annular member.

References Cited in the file of this patent UNITED STATES PATENTS 1,310,118 Greenfield et al. July 15, 1919 1,352,829 Nelson Sept. 14, 1920 1,502,729 Lippert et a1 July 29, 1924 1,756,592 Harrison Apr. 29, 1930 1,792,733 De Wein Feb. 17, 1931 1,886,807 Heidlofl Nov. 8, 1932 2,132,565 Graham Oct. 11, 1938 2,646,689 Maher July 28, 1953 2,787,914 Nelson Apr. 9, 1957 FOREIGN PATENTS 258,332 Great Britain Sept. 16, 1926 OTHER REFERENCES Motor, May 1946, page 39, published by Motor, 250 W. th St., New York 19, NY. 

